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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0702403864f8abdfde656076c330d3187cae3f63bde63940ccc056893102c4f3' 
  AND token = 'WTpg/Vy5JyMzFhFA2WxSxI9rE5Rl5LxYl7q7E2OSEfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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