Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2929dfb4a7598c31448f770bfd24e14df6f9fc2bcbef77a0d8a2de19f7a50392' 
  AND token = 'KRRML+HHsgBPUG2JMxeRcvm6Q1T/VuRomU0bi4IsK0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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