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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '194481135dc18b885064e9549130ba22c54aa44cb68330547709550b88351522' 
  AND token = '18avMF4ssMsBxffd10YcFSPwSkGqEwzs4DF8/oI55fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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