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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a115f8a6505771b91dd5199dc4cb44eafe49717cff5ca1c48767ecd4a5c33293' 
  AND token = 'wO4qINbvUhYlpLJhsfiTj4W42X6BPBuJCrvLExchCbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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