Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a714770156a79b518b021bd89dd136314bb48789b8cf06b5d2263e70074bc2' 
  AND token = 'nkXHWdDvmGUcSnutt227AAcI8IL099DslZ8YSnQspMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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