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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e5d4d9df284614b52bae66e57c0e87709352680a406f6d631df41086b62f5d42' 
  AND token = 'awsMwR5i30aJzJ0kY/LYTnBwVWE022MNdeD/ZwpbMqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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