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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6b58c6046113a9a6725949abc32c57dcfc0097f41006c1bb1650afc4703d524e' 
  AND token = '5Pkt9suakb9n+iA2/n8YREIMFJBIUvJS11gzN8svmxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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