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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '862a4860d58c92e3921f03ba1561128ed9cc81b691fd8c5e12c7b1ec81778c5f' 
  AND token = '+32PiN72W962YdplUHtLE+kb1+DxrExXx6LP7T/CTY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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