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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e0e0cca78445b924dbbedaab19506628bd583a2c0250c3914838309dfb5ac282' 
  AND token = 'BM9z66tqIZcoUgP3UWsAfAj89CaZdTD44cEfx+ASd7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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