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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '829f05f774ecaf39d848b1f0da212eb24e5247b01b62a54fa1524f0e43ed6ccc' 
  AND token = 'B69J1i5docb4UMRr31icVkg2ggU0PXy7zcNAK+Owo04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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