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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f0b3ad9223b2f7833e558dacfa0da6f68b9e84fe7fe928f5cb3bbc81ce5ba475' 
  AND token = '317AxIUffCPi4o1sPjNk+g7p/E8cGZLpXQ7vduUUWjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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