Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc2c3bdb2126256ac72d524e7676d95303c63db982959eb0a0f531c36738284' 
  AND token = 'VeMyMCenc96JCwF5Q6KZ02id1PckbeO3tvQU15+TfbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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