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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f0e7e768ebcf66f9d75457f226971a6e8397dc5d39c0725e4d5a92c4eaf3f048' 
  AND token = 'YoXcG2w4R5VgDENCJ6DqMapiPP8c+XXMQma7NP/5IAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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