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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '33d7af153ae36495bec99a423edf38d04192ef8e8f12b61cd0a8e1e36cb7fd7f' 
  AND token = 'oi4g7vMgffXWpAdmFaYzcv2lY+ZWAvSLt/imYa3ympU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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