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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ba309f88c26bd288458c3aa54d2954f7abc01fe633550e54cea0dbb63dc0cfad' 
  AND token = '67/fGMAUFliRhsk4Mi27ICIdEFq3cQ1T0icCYvSUc7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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