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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '49fc49b2d3906a29d4c46b76ea2f0d7cd571105f96e82f853f74808b65e21a44' 
  AND token = 'K3VkjTW1lFZhnXLSuNEe39JbuwMXtaP9FubrTxpXxS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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