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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c9c0ff51118406c421c4bf85ed5f5cb4b5ae89815734afa1e13eb0d4afb46585' 
  AND token = '/siCIA3KOfyPunC1nlRi2SzGf3liF9iNHmcIgD0d64Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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