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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '63579cc594f601b9e18963857c0344a78ff199c466a5701c7ae17687c88d3094' 
  AND token = '88jwdaf+OnFgAuM2C6ylZOWUPBt8zE0/wl1q+BeCjX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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