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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a35b1de9b11296b8dba6b771d93732bc57bc3098c0a7ef15fe82e6463e8268e0' 
  AND token = 'nNj4XNvAx93io50Acs14d2SJzY3WXWDu/tJJhwWKAUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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