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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '69eedf7177168eaa53b94140965f53b6174b35facb2a1c2b4bb26411b4ba0897' 
  AND token = 'WzXHDc6LZ4lsQSRpB4WfQzRRzJM8jOG4rJ6vN/kthkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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