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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6cc4dc0a0348041ec96b2e4a1bfb74ff658706a8437fea4d12386a1117e55600' 
  AND token = '1q50hSKJ2lqmURkA8wLkZJVoRnRT1256CAQ25bKUiXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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