Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2efb25e5d4195006ae4f5c7f771d07daad89a7a5422d15a1188a91d982b0ffa' 
  AND token = '/4fowD7G15oG6d5/43LMinesG72AF5AZf1m8zzFSybU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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