Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '279755d2b193f60ffc60f15d4fd56a5dc81ed2875eb0b1c3c400619a4748d2e7' 
  AND token = 'QaejgX8NZ2JEeNftgKRX70eL6FZJXt15QvL3Dse6luo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}