Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40c0a00a7f0cb1a7f8f9ecc4c55ef629f2cd765e199501b54680bdcd5089e9f' 
  AND token = 'eWHAGzte03fY/XZIzS6Rm93CREBAmyeDi0tsGCoAFd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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