Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5d1160f74ed3132a7522cdc2865b86299e86c9bcf9e78bc513e082cdef16f9' 
  AND token = 'kkm3yFqgot7rw/FucAaH5Ug6qxZDE+RZxYZWFZ4zSQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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