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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3f4721755652fde816b6b9afc5a710e629ece1fd7d7f5e88a76f16abd566ccf8' 
  AND token = 'FEj2630NTbEaNYRMU5PCxMs1DdM0+zQrcU3qWKiUXh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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