Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6750a3b4063a8eb394d85c4b3b708d190c84a9143b3556c362c71b414e97e7' 
  AND token = 'SaK3kDy2zmOEWC6FMNj6TKswFVUNUoZR3WnbnJyJE6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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