Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '888ab509f797ae1685a374c72655711dde2b752a8c990791008bc84f80d67b74' 
  AND token = '2iApn6jfNIJJvrCrspjkNxNNxwlQjnOoCrmkuIDVaZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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