Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a56f2ff25aa83cb5831672f68b3238faf4741ed7414ce1c854f49baf6266042d' 
  AND token = 'xsK9d5IStcgeWHxPUELZ1+/v8k2+aDUVj3Y2jDXL62s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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