Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6515da9a505abf4acdae49cd2ef61f795ee8f9e097e4f907884811011166c8ad' 
  AND token = 'spSZEfohiC0txTQPiqanM1L8ftyAfPEHkEcb1WXa7To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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