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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dc122b0e4ebcbf87403185f029615b89af3978e21e24c7757210b1d5a8ee7746' 
  AND token = 'LbwNbAiue54g7xVfYvkfNB+obCrH1uRYubXaTEDLYuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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