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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1e36cfe3198020bbf4400b795fdcb0248e97574ef6794eecba20cb8e6b208d25' 
  AND token = 'OMbQFOiZsw0xYWgY81gQ134zS0mz/0keBrrYl7zYXa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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