Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2c80342b4376424a36f6a3c9a1b7cefe0b79a25192f9e36e47384a2ab55018' 
  AND token = 'zZNRRJcYzxaVcvAkSAZNVQFgoOdfGgEmf2IiFrgCayQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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