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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7e82760a7d2811b097eab8e1e19acc18deeec0cbcfe290f92f94b1c803bd9a56' 
  AND token = 'KvxPDurJKXXmG5fVgLX5h3oifbwE8QwgqcoZcGF4xpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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