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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8c1a1a8473e0979b8fef6d15dd84b661214f80c67a3beaab9ad768a1440ecafc' 
  AND token = 'bRPXyRgS+EyNCxWN86ExEuQYE58HzO3TXHYF2XozJT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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