Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a7f2de948fa8edb40a5d78ef092dd8756fdc40c6111d4cb56b2291c084321b' 
  AND token = 'Xd+RT2dEgz6ijgIdBxF11Qu9ip5imm/utYv7XGTVEcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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