Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e8f88074cc39f7695afb48966fa373fe0ed29e4e72f3b4cc41c789fe5291b8' 
  AND token = '3xKLO3cwKsj7CxB8Yi0uBQkOa8eCJU+EWSfZWtVBUmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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