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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2f5bbba5cf4b3fca9303db30cddea4d53f1c87fec4f05197886f6a9d20c1ff38' 
  AND token = 'lgFvJ9fa195YTy45ki8jixpi6tg3RzqrcFC5pRy4rWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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