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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9c7e2a0210a06910ad94d01592a384cacbb14ee44d93b18d578fb0f606b902e5' 
  AND token = 'Kt8yCg5XAmN7XznONSQlz6AeWnTKMa6HAf2V0GF3qOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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