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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e3e2b57f5928b4a5aaf3fae853bc566a99b4492b34aa8d9e75492f88a54d4c31' 
  AND token = '88WAuC+XEQERLd7NSLsKG/n7JmNm/lXkDf/gWeWNkjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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