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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd9ce3aa0ef883b75ad170b48181b542df99c402903996cbae61506b56e9937ff' 
  AND token = 'h3BfuyRZEzYp7UV8u24xz3b/I258yJhdsLyNUG5ERm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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