Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8a2fb88a228cb7f64fddcb665d980bb521fa633a781c5bae90100f34705862' 
  AND token = 'JRv3Qu8+hAtkdWs2IVaQsF2G9VkRsJsoUCm7Yo7G4Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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