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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3c6109e6f04d386b7c09887cc20ef9d69a32fc3a4b77feeb7d1f18425b0c8702' 
  AND token = 'sTMJurCXtTZwqfqzCmdCLYei91oAiIdqYnSNck7ttuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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