Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d8338eb97421a54f71bc0022a54d0cbb9ff6b84333e7f613bf5c7e0697865d' 
  AND token = 'Z+aBBp3vR0bjuvAJTBwLlMNeTwmlTg3EZnXL+3fdBjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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