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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '37b32bffe2360a3714063d594b70e66cec3963d641d00d0eb79cc574bf9c3a2d' 
  AND token = 'PXO8thVRLA6WMIR9TQxtWvDbzXeQe4YtXRwbmtczR10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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