Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce24ffa3b0fe7362235f6a63cea6521681bd8fb74f0b74a834d263a4cc257b36' 
  AND token = 'ARkGeGztU81C7l5Se0pBfPyAcJunsJIhFdY6SCe3jmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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