Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b19bd18cde6a620dfb39f2d6e509723a4fe5cb616b44bebb6e831a86d97f34c' 
  AND token = 'JUbsZGo210CyB9dBOjLyhX47aj7hkAgNy10mJopw27M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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