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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c4f26c3e94cddfa4520253560bca2b1dd9770b49dc64467d21c907af43f57a99' 
  AND token = 'prN0qJMyh/XcyXSnbC7xX3ALqXI+dRtO7mxw/lV1VI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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