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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bd612afb5720d5bd614d24fccdbd72c039d2a26ef6939c16fefa6f7c4b865681' 
  AND token = 'oS0XE3xNhcOYWjibPwnPab6W6GcD0GDLTAJt9z4iy0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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