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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '55bbf522c518f010600a0e6c8e9bb1781839decfa17e8860e08fda6fe8adce27' 
  AND token = 'oGjsFWnyUHjAd1VRQwRd68At63Oeq3TieEDrKa10L4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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