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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5f1a84f86225fca2b8e1afc12e35ee3b6ceae923b6d9f8fa87ecfc53bf66ff12' 
  AND token = '2ng8lCAmOhwJz/au7m8awBmGdgelUiMQsxs8MalqYVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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