Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb20101613026337fb324c04d2a112664637f037a0f78df3a4e8a36b7e3e4cc' 
  AND token = 'w+gVxGpFgeRaMXbN7xBpYR6oPXT/5creDmiJ1x6/D3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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