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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '89106798b354ad2d82f4faffabe00ae2b0ebf37f172c6aa78bfaeaff2d6de305' 
  AND token = 't8/8vvnPLrejHJJFUZ9jj5Cw+jfhb4kv5bFdqwVMiic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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