Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c038772012f1ad74487d7a3bc3763cea37c105b0f9142f6989570d9d29a1a1a1' 
  AND token = 'XP0yUYTtyP+ahIummGZffrHEDKgEcZLTbWDGknakU3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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