Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71dd092f3c88eb2d144c7d56e0b89e859b5f5e6890205eaf390771ba33504bbf' 
  AND token = 'EPyefOlVfCSE+bMxSynjyinz4EmreVjt6tr5cCeMc4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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