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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3381113b831440e2dd3c1d1b9006910afa38769e4c658ed3c359170deb67ae5b' 
  AND token = 'xFSTeuoFZLOnWacnPtV4nozc+6ozctYIJguZIck9VgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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