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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '227cae945feb442daf620f25beaba4b69e4770cf0d49ac5650d2383b832a7ed0' 
  AND token = 'sV/ojuyYGDx4hmHM4M/40P37E07/yXED71vHU6tHBtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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