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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '92c8760b3f5a3fad387e090a1d27340df443982a16c69529b816a361d15f13e6' 
  AND token = 'D+ASOr8emb9Qw1nfi6K51HTbASJja0eFqnx8t+0+RnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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