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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fbce0c5b7ecb767343aa83d5e442929f19b08ae83e55463d0557400bc18f875a' 
  AND token = 'DPyrVnWnJhjiiWi/yGbCvCDjS0DTI/FdcYJeEVIoieo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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