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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cdf025caf45020d64b0840dccec79a3e0eb8abbee1e97730d2b066d909580271' 
  AND token = 'p1mFoh/09B+Ku5B4mkCrRALLLhabMdzESxDlnbDQ680=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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