Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b37d02e65bf448fb955b60994b93ea527b6ee4abfa7c0a4a99a11e69faf755' 
  AND token = 'JceQgBaAQHN8GPfhuT1d76B05LIV16EAC5wRRdgbBvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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