Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '37b7ddda0067ce8aff94b123012d26bc8fdb38aaf4ed3ac9478f5513f3de6f41' 
  AND token = 'kChndwfCxYN4aXOsvmD2vVrFCFnUIYnDES4eIC+lbHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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