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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3a3269c98f386d2bdb164a6f003ff3b1674216f7c24f96d331bc7632f2d708d6' 
  AND token = 'ns6/bqNBGKpPPGJcpl5N8qdpUickUPErzQuxWTXVeBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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