Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b4b53c7f654129b24e928ce906043cae36bfd46322f50f0fcadf49114327c9' 
  AND token = 'Sl1qfU4aemdnWYZypg87gE1L1cr8tfV/v+cs98D27n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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