Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b561cb078b21c979ad9fe77683df1df67b26c273ec4ee215f41fa3c8608533a' 
  AND token = 'q4MooybWn8Kuj40uFtCAhcYHYubBXJCo042lkaVCvo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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