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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5062daf89561cd621d878c70e8971a6304dd619104e3943c129b3eef76c68f34' 
  AND token = '+Q026V4PjHDr04NWtXcF7KDYa9AsDUjor/in7fc0PMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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