Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e69edc3dcfe3a96368271757f32c8ed22690e591f80aba5b0e9d360ceba5a79' 
  AND token = 'yOfsrtd5LqTPR3eCqVs89PsLTG107O6GPWUFT+3K8vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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