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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '94bb4f19f963ecf8fa10da5f8d89562123ae03d66f0ce20865c2d951db95b804' 
  AND token = 'ol3dEiWqWnxgcvBJ9qvoa/8RV3BdRNh6i60F5LcP0LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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