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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8179565ce0f0fdd2364d37ec02898b3a3e1af7381fb518eee9c63d3a6fe6cc43' 
  AND token = 'yyip2vyyWGuzYwoW3vhbU0+UelYIhYbTKPykHjKLidA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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