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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2b61297fc8ef4100214c0fac92c20de05f99c20f92b5e07c9657023cc113025c' 
  AND token = '0YHKFpba4tgPjbri1TdUhaI7e2kOLrWVbMoz8C5/cOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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