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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2cd6c5460be1e660f5fe58727e33f24b4c5a47695f3d59acb62f2b4047cc6f26' 
  AND token = 'cRMA7VX25uBzfvrAwDnNQbrNzNEM1vdLQBX/6dRxQKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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