Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574728b3c6f51432b53c17c5595a28af4dda4077f71ce6cfbca1e105ad98835a' 
  AND token = 'XytZmSYonVeIl30sk878bgh/RHoRBjbOHaULydDQtkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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