Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7dc1ee35f591ede542eb465689d3ae69d4b4b525400e3a2c30d4d79f0b6a440' 
  AND token = 'W6MYxf0gANPErpPgW51wuBOExTQtJr5XDqUZKFHf3Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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