Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ad355179b0c8c42204f9588c6f04834fd31fe358c3617d929cc275797bf132' 
  AND token = 'oV6rcacfitQ5cvxH8xeseo+uM1U6W4z7AvDzEKMegAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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