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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '10c3b13e492c68e08b53c9d7e7eb3b047aee08e27bbda8d8dc28e594882fce8e' 
  AND token = 'H88HUyh4UsdPwIjFj+MxVWEPiddQ/kH2eoKtc+dL64w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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