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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ae53c244f53534c008f8eca44f4ffb552a7074f79261541b9ba8b8d4983bc725' 
  AND token = '96OdG0n8kgabNqNZDblohmoSww32tW4E/GrgcjUsW2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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