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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0e8168b1281b52285f089dc88e233207b80e44d6db8b6be026cf8a0a257879c3' 
  AND token = 'TiKVC6Ib/DvMkAwgd9UX5EulsJ9c/KlAoW98XCIYAQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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