Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd437756e5a1c9122479ce8bc029860f1366ce6bb76fcfe9cc792d5de00e7b3c' 
  AND token = '6E7z7kvQ9xKhGlj76AztiJHYkYQICBPYUKsdIVAhTm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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