Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f81aa5e85ddd9abef6353b9cf36d998de0c0a8e7dfe6056f73a9a667b7c755ef' 
  AND token = 'Kl2obX4EwUrLy1n9BcoDRhY3NnhUUuB6q1SZ4xN5748=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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