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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '111a36434a162c1791ce0a495079e230ddedb06bcad62b57298546a965d246c5' 
  AND token = 'INCO116NkAz4cVxm6HLxsEpI52C/MeFqlloV8g4gn7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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