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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c4b8be1e3ad6aa24d8c3718953416568a32a4c0175c6096ccd9b69e558848b79' 
  AND token = '9fzUVo/dQWL9NedlNB5oQMEQhRUiUTT6AeFCAzOUlHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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