Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81552efbb4d8705aa84dd33c10042204bcfffbbf9a82fe9b32ed2c4b08fac6e6' 
  AND token = 'jI8HJv19ZU7fkgo1tFvqn2a2kDdDfxRzD8ORBcVAU3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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