Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc9c16555830d0b813295d856b0e0d75a2e7ca45eba67017e7401bc9cb0db42' 
  AND token = 'm8WHpqtpLubhub7mBK4n1O27BCdGiqKt2XwXWgpm+4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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