Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab84aa3808805b695a33215e66f027ffb790ade3372a84cc2bcf72cc51b9a70' 
  AND token = 'gGUjQxueejG0iaUToXnaTnocfr72UXwYo0JsdVIddSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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