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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98ee34ef5363e9a2ef857ec40722f387c43cc382481a9f972303ebe203f1fa3a' 
  AND token = '9GiUrUKdmwHkugRL2P6gjWctkj+rbCPvNl5uzS+orLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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