Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03aa86d0d757276d97d79e48830ffef9576d821701efd137554b8752acf9cf23' 
  AND token = 'PHWjp9Ccv6n6QlVGb6uoZEb8K54WParnNSRWLTKZth8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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