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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6923ee637522b6aea2b306862efadae34d0c488389b69c36350f59f15fbb6e2f' 
  AND token = 'YSibJynxEDHeePwc+emvMpsMS+T+xm7EwJDZkniV/cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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