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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd26a4a5e375eb90a46bd516588b53a7a04be038b5615355bb7f357d4745d3c7a' 
  AND token = '/W3xMO2GrxQXWQgVC9KDe3f/Oa1+SO4t1NN+MX/wdlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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